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Fix panic when redirecting nothing (#12970)

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# Description
Fixes #12969 where the parser can panic if a redirection is applied to
nothing / an empty command.

# Tests + Formatting
Added a test.
This commit is contained in:
Ian Manske
2024-05-27 02:03:06 +00:00
committed by GitHub
parent f74dd33ba9
commit 6012af2412
3 changed files with 111 additions and 84 deletions
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148
crates/nu-parser/src/lite_parser.rs
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@ -51,12 +51,21 @@ impl LiteCommand {
self.parts.push(span);
}
fn check_accepts_redirection(&self, span: Span) -> Option<ParseError> {
self.parts
.is_empty()
.then_some(ParseError::UnexpectedRedirection { span })
}
fn try_add_redirection(
&mut self,
source: RedirectionSource,
target: LiteRedirectionTarget,
) -> Result<(), ParseError> {
let redirection = match (self.redirection.take(), source) {
(None, _) if self.parts.is_empty() => Err(ParseError::UnexpectedRedirection {
span: target.connector(),
}),
(None, source) => Ok(LiteRedirection::Single { source, target }),
(
Some(LiteRedirection::Single {
@ -162,94 +171,59 @@ pub fn lite_parse(tokens: &[Token]) -> (LiteBlock, Option<ParseError>) {
for (idx, token) in tokens.iter().enumerate() {
if let Some((source, append, span)) = file_redirection.take() {
if command.parts.is_empty() {
error = error.or(Some(ParseError::LabeledError(
"Redirection without command or expression".into(),
"there is nothing to redirect".into(),
span,
)));
command.push(span);
match token.contents {
TokenContents::Comment => {
command.comments.push(token.span);
curr_comment = None;
}
TokenContents::Pipe
| TokenContents::ErrGreaterPipe
| TokenContents::OutErrGreaterPipe => {
pipeline.push(&mut command);
command.pipe = Some(token.span);
}
TokenContents::Semicolon => {
pipeline.push(&mut command);
block.push(&mut pipeline);
}
TokenContents::Eol => {
pipeline.push(&mut command);
}
_ => command.push(token.span),
match &token.contents {
TokenContents::PipePipe => {
error = error.or(Some(ParseError::ShellOrOr(token.span)));
command.push(span);
command.push(token.span);
}
} else {
match &token.contents {
TokenContents::PipePipe => {
error = error.or(Some(ParseError::ShellOrOr(token.span)));
TokenContents::Item => {
let target = LiteRedirectionTarget::File {
connector: span,
file: token.span,
append,
};
if let Err(err) = command.try_add_redirection(source, target) {
error = error.or(Some(err));
command.push(span);
command.push(token.span);
}
TokenContents::Item => {
let target = LiteRedirectionTarget::File {
connector: span,
file: token.span,
append,
};
if let Err(err) = command.try_add_redirection(source, target) {
error = error.or(Some(err));
command.push(span);
command.push(token.span)
}
}
TokenContents::OutGreaterThan
| TokenContents::OutGreaterGreaterThan
| TokenContents::ErrGreaterThan
| TokenContents::ErrGreaterGreaterThan
| TokenContents::OutErrGreaterThan
| TokenContents::OutErrGreaterGreaterThan => {
error =
error.or(Some(ParseError::Expected("redirection target", token.span)));
command.push(span);
command.push(token.span);
}
TokenContents::Pipe
| TokenContents::ErrGreaterPipe
| TokenContents::OutErrGreaterPipe => {
error =
error.or(Some(ParseError::Expected("redirection target", token.span)));
command.push(span);
pipeline.push(&mut command);
command.pipe = Some(token.span);
}
TokenContents::Eol => {
error =
error.or(Some(ParseError::Expected("redirection target", token.span)));
command.push(span);
pipeline.push(&mut command);
}
TokenContents::Semicolon => {
error =
error.or(Some(ParseError::Expected("redirection target", token.span)));
command.push(span);
pipeline.push(&mut command);
block.push(&mut pipeline);
}
TokenContents::Comment => {
error = error.or(Some(ParseError::Expected("redirection target", span)));
command.push(span);
command.comments.push(token.span);
curr_comment = None;
command.push(token.span)
}
}
TokenContents::OutGreaterThan
| TokenContents::OutGreaterGreaterThan
| TokenContents::ErrGreaterThan
| TokenContents::ErrGreaterGreaterThan
| TokenContents::OutErrGreaterThan
| TokenContents::OutErrGreaterGreaterThan => {
error = error.or(Some(ParseError::Expected("redirection target", token.span)));
command.push(span);
command.push(token.span);
}
TokenContents::Pipe
| TokenContents::ErrGreaterPipe
| TokenContents::OutErrGreaterPipe => {
error = error.or(Some(ParseError::Expected("redirection target", token.span)));
command.push(span);
pipeline.push(&mut command);
command.pipe = Some(token.span);
}
TokenContents::Eol => {
error = error.or(Some(ParseError::Expected("redirection target", token.span)));
command.push(span);
pipeline.push(&mut command);
}
TokenContents::Semicolon => {
error = error.or(Some(ParseError::Expected("redirection target", token.span)));
command.push(span);
pipeline.push(&mut command);
block.push(&mut pipeline);
}
TokenContents::Comment => {
error = error.or(Some(ParseError::Expected("redirection target", span)));
command.push(span);
command.comments.push(token.span);
curr_comment = None;
}
}
} else {
match &token.contents {
@ -278,22 +252,28 @@ pub fn lite_parse(tokens: &[Token]) -> (LiteBlock, Option<ParseError>) {
command.push(token.span);
}
TokenContents::OutGreaterThan => {
error = error.or(command.check_accepts_redirection(token.span));
file_redirection = Some((RedirectionSource::Stdout, false, token.span));
}
TokenContents::OutGreaterGreaterThan => {
error = error.or(command.check_accepts_redirection(token.span));
file_redirection = Some((RedirectionSource::Stdout, true, token.span));
}
TokenContents::ErrGreaterThan => {
error = error.or(command.check_accepts_redirection(token.span));
file_redirection = Some((RedirectionSource::Stderr, false, token.span));
}
TokenContents::ErrGreaterGreaterThan => {
error = error.or(command.check_accepts_redirection(token.span));
file_redirection = Some((RedirectionSource::Stderr, true, token.span));
}
TokenContents::OutErrGreaterThan => {
error = error.or(command.check_accepts_redirection(token.span));
file_redirection =
Some((RedirectionSource::StdoutAndStderr, false, token.span));
}
TokenContents::OutErrGreaterGreaterThan => {
error = error.or(command.check_accepts_redirection(token.span));
file_redirection = Some((RedirectionSource::StdoutAndStderr, true, token.span));
}
TokenContents::ErrGreaterPipe => {